Another plasma component...
- thefabricator03
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I am using a Hypertherm 125 Powermax with the factory 50:1 divided arc voltage out of the CPC connector,
How do I set the correct ratio with the THCAD 10 board, I have read the manual but could not work out how to set it.
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Yeah I have not scaled anything. Do not know how to do it.
Ok, so post up here:
1. The maximum torch voltage at full scale based on the resistors you've added
2. 1/32 of the full scale frequency on the back of the THCAD
3. 1/32 of the 0 volt frequency on the back of the THCAD.
I was going to the shop this afternoon, so I was going to update plasmac so I might be able to help out later.
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JTknives wrote:
Yeah I have not scaled anything. Do not know how to do it.
thefabricator03 wrote:
I am in the same boat,
I am using a Hypertherm 125 Powermax with the factory 50:1 divided arc voltage out of the CPC connector,
How do I set the correct ratio with the THCAD 10 board, I have read the manual but could not work out how to set it.
Guys,
This is how I did it using a battery.
Cheers, Phill.
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A three checkbutton group for THC Mode:
0 - off = permanently off
1 - on = permanantly on
3 - auto = dependent on THC in cut parameters of tool
Cheers, Phill.
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- thefabricator03
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One last question, Do I need a resistor if I am using the hypertherm 50:1 divided voltage?
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So where phil said in the earlier post
My values were:
arc-voltage-offset = -3805
arc-voltage-scale = -0.000406
You'll need something like
arc-voltage-offset = -3805 <-- change to your 1/32 of the 0 volt frequency
arc-voltage-scale = -0.000406 <--- 10/500 = 0.2Please Log in or Create an account to join the conversation.
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- thefabricator03
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Stefan, also look at the other alternative voltage divider settings that you board can be set to. The default 30:1 on my Thermal Dynamics is near perfect (300 volt full scale) . On a pierce it goes out of range but PCW says this is fine and is a valid way of getting more accuracy as you use more of the fullscale when cutting.
Just checked my Hypertherm and there is a 30:1 scale on the board so I will set it to that.
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I pushed another update:
- remove duplicated ini file entry - doesn't really affect anything, just a tidy up
- change resolution for arc voltage input scaling and offset
GUI files changed are:
configs/sim/axis/plasmac/native/plasmac_axis.py
configs/sim/axis/plasmac/gladevcp/plasmac_panel.py
configs/sim/gmoccapy/plasmac/plasmac_config.py
configs/sim/gmoccapy/plasmac/plasmac_panel.py
I have fixed the upper and lower limits, hopefully by enough to cover everything.rodw wrote:
The on screen scaling does not work because of enforced upper and lower limits in the config screen as I can't enter an offset of 3659.375 (0-100 enforced)
Also the maths in my earlier post says the frequency counts per volt is 83.73 and you have to input the reciprocal of this which is 0.011943151 which is not logical. So I would recommend that the maths be changed to do the reciprocal stuff internally and also remove the enforced range on the scale. If that was the case I think it would work well with some explanation in the docs.
I don't want to change too much as I don't want the component itself to be dependent on any particular hardware.
I rigged up a 7i76e with a TCAD connected to the encoder input and two batteries for testing:
- run LinuxCNC
- open halshow and watch plasmac.arc-voltage-in and plasmac.arc-voltage-out
- set arc-voltage-scale to 1
- set arc-voltage-offset to the value read from plasmac.arc-voltage-in
- measure battery voltage
- connect battery to THCAD input
- set arc-voltage-scale to battery-voltage / plasmac.arc-voltage-out
could probably fine tune further but it was good enough for the purpose of the exercise.
My values were:
arc-voltage-offset = -3805
arc-voltage-scale = -0.000406
Cheers, Phill.
In my machine.hal I don’t have arc-voltage-offset I have somthing listed as scale and filter. Where are you finding the actual arc voltage ofset settings? I did find settings in the mymachine_config.cfg file.
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Just checked my Hypertherm and there is a 30:1 scale on the board so I will set it to that.
I thought I saw they had different options. Good find. I think that will yield a better outcome as you will have a higher count per volt which will give better resolution.
@JTk, sorry I can't help there as I'm not in front of a machine.
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